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Proxy Firewall

Proxy firewalls watch (primarilly) the following fields:

  • Source Port Number
  • Destination Port Number

Some proxy firewalls also perform network address translation (NAT) in addition to proxy address translation (PAT).

provide protection by performing all outside connections on behalf of the host, literally translating internal TCP and UDP port addresses to outside port addresses. Many proxy firewalls are stateless, and are therfore more easilly tricked into permitting connections they should not. Moreover, since the proxy firewall typically does not inspect the contents of the packet, it is not capable of supporting IPsec functions (VPN/tunnels and encryption).


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